i have a 2008 scion xb. it has a 165,000 mi. the vcs off light stays on. the ca

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the car has begun to stall, runs very poorly as if it wants to drop dead. we have changed out the plugs, the coil wires, fuel injectors cleaned and rebuilt with number one injector being replaced. the car is emitting raw. could it be a vvt i sensor, where is it located? does it affect the shifing of the transmission since the rpms are affected? please help. sincerly out of my wits and running out of money and patient.